Determine if the argument vX is a complex (or real) number, according to the way that complex numbers are represented within this library, which is as a string like "R|I" where R is the real part and I is the imaginary part of the number.

vX: The value that is checked to see if it represents a complex or real number. Function returns True if vX is numeric or a complex number string. Function returns False if vX is a string which does not represent a complex number. Function returns Null if vX is Null or cannot be fixed up to a real or complex number (as defined by the ComplexStringToReals function).

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